We're sure it was all very reserved
The boys rocked up to The Arts Club in Mayfair, and if these pics are anything to go by, soon found themselves surrounded by the ladies.
It's not exactly a secret that Niall Horan thinks Alexandra Burke is fit, so he must have been having a whale of a time. Good on ya Nialler.
Bit awkward for Chloe Green though.
Click next for more pictures of the boys at the party!